hex: make wraparound of the index into ring-buffer explicit

diff --git a/RelNotes b/RelNotes
index 66606735cbf4b890b8faf5be7604508bc37c9256..c02235fe8cdd9900a1ce6430780b46e3ed84a45a 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/2.9.0.txt
\ No newline at end of file
+Documentation/RelNotes/2.10.2.txt
\ No newline at end of file